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Effects of lowering the catalyst loading and temperature.
| |||||
|---|---|---|---|---|---|
| entry | M | temperature | catalyst loading (mol%) | ee (%) | yield (%) |
| 1 | Ph3Sn | 0 °C | 20 | 62 | – |
| 2 | Ph3Sn | −25 °C | 20 | 81 | 66 |
| 3 | Ph3Sn | −25 °C | 10 | 68 | 66 |
| 4 | Ph3Sn | −25 °C | 5 | 31 | 57 |
| 5 | PhMe2Si | 0 °C | 20 | 62 | – |
| 6 | PhMe2Si | −25 °C | 20 | 86 | 56 |
| 7 | PhMe2Si | −25 °C | 10 | 79 | 52 |
| 8 | PhMe2Si | −25 °C | 5 | 17 | 53 |
